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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 256 |
| 3 | 784 |
| 4 | 2401 |
| 5 | 17689 |
| 6 | 130321 |
| 7 | 577600 |
| 8 | 2560000 |
| 9 | 15054400 |
| 10 | 88529281 |
| 11 | 443060401 |
| 12 | 2217373921 |
| 13 | 12151975696 |
| 14 | 66597028096 |
| 15 | 346652467984 |
| 16 | 1804403844961 |
| 17 | 9669593502409 |
| 18 | 51818243883121 |
| 19 | 273150984198400 |
| 20 | 1439868559360000 |
[16,256,784,2401,17689,130321,577600,2560000, 15054400,88529281,443060401,2217373921, 12151975696,66597028096,346652467984, 1804403844961,9669593502409,51818243883121, 273150984198400,1439868559360000] |